Jack



July 7, 1925. 1,545,380

W. C. WOODINGS JACK Filed Dec. 18, 192:5

' mvENToR Patented July 7, 1925,.

i unirse s'rAr-Es PATENT ori-*ica warm/r." c. Wammes.. or venom;rernsrtvanraAsesinos reet, worms, or :riassume @massimale A,cortesemente measureme- JACK.,

Application f lod December- 18, 18223, 8eria1'Np. `68153310.

jacks and more particularly tok improvements therein `for the `purposeof minimizing weer and friction between the frame. and: the

lifting bar, for increasing the length of life e ofi the` jack, `anddecreasing the required power for operating the. same.

It has heretofore. been proposed in the art to which this inventionrelates to4 provide antivfriction means between the. lifting bar 4andthe frame, in order to. decrease friction therebetween 'during the. oeration ofl the jack. In the constructions retofore used, however, theanti-friction or rollers have usuallyV been mounted' loosely in` apocketin the frame ofthe When the lifting bar was operated, the balls orrollers, being loosely mounted, all tended to move towards one end ofthepocket and to jam' against each other. The rubbing action between theballs or rollers and between the same and the lifting bar was such as towear flat surfaces on the anti-friction members and cause them toeventually lose their ability to rotate. The anti-friction members(thereafter simply acted as a single stationary friction means betweenthe bar and the frame. In other words, the anti-friction members thenfunctioned to increase the friction between the bar and the frameinstead of acting to decrease theV friction therebetween. Anti-frictionrollers have also been employed to rotate about `fixed axes, these fixedaxes being provided by pins or trunnions journalled at their ends in theframe of the jack. This manner of mounting the rollers not onlyincreases the cost of construction, but also increases the difficulty ofassembling the parts.

By the present invention, I propose to i mount the anti-friction rollersfor rotation jackl This construction enables the rollers' i to bereadily placed the bearingsand the assembled rollers and bearings tobe'easilymounted in the frame.

In the accompanying drawings,` which il` lustrate a preferredembodiment-of my in-` vention, 1 i" Figure lis a side elevation,vpartly'broken away, illustrating a jack havin-gimy i 1 nincorporatedcomprising a frame member. and a `lifting bar between whichthere lijs arelative move ment `axially `of the bar. In the construci,tion'illustrated there is provided a frame 2 havingan opening 3extendin longifV tudinally therethrough and in. wi ich is located aliftingbar 4.- The lifting bar is formed with a series of teeth 5providing an operating rack and is provided with both a lifting foot 6and a `lifting head 7. As is customary in the art, vthe frame isprovided with a pivotal mounting S'for an operating handle 9 whichextends beyond the opposite sides `of its pivotal'mounting. On its innerend the handle carries a pivotally mounted lifting pawl 10, which isadapted to engage the teeth 5- on the lifting bar for raising the bar asthe outer end of the handle is swung downwardly. The bar is held in itselevated position during the return movement ofthe i operating handlevby a holding pawl 11.

During operation ofthe jack, it will be apparent that the lifting pawl10 tends to force the lift-ing bar away from the pivotal axis of thepawl and into engagement with the rear portion of the frame. In ordertov minimize to as great anextent as possible the resulting friction,anti-friction rollers l2 are arranged in a pocket 13 in the frame. Theseanti-friction rollers engage the rearv edge of the lifting bar andprevent the same from coming into frictional engagement with the,`

rear portion of the frame. journaled in open bearings formed in a.U-shaped member 14. This U-shaped member Mis of approximately the sameWidth and length as the corresponding dimensions Therollers 12 are Y, Y105..

of the pocket 13, so that the U-shaped member is adapted to fit vsnugly.in 7.said

pocket. w a

It will be apparent that the Ushaped member 14 maintains the rollers iniXedx spaced relationship and that the construction is such as toenablef'the rollers'to be quickly mounted in said bearings and thebearings readily asselnbled in the pocket in the jack. While I haveshown the bearingsas formed in a U-shaped member, it will beunderstoodthat the invention is .not limited to this particular form vofconstruction, but

2. In a jack, a frame., a lifting bar,-and a f plurality ofanti-friction rollers eifectiveintermediaterthe frame and the liftingbarv for maintaining the bar out of' direct sliding en-A gagement withthe frame, said rollers being mounted in bearings which maintain them'-in fixed relationship, said bearings'being lformed in a removable memberwhich is held in'position by said lifting: bar, substantiallyl asdescribed. v

V3. --In a jack, a Yframe, ay lifting'bar, and

plurality of spaced anti-friction rollers arranged inY a pocket intheramegfory maintaining the barout of direct sliding` engagement with theframe, said rollers being mounted in bearings formed in a member whichis held in said pocket by'4 said ylifting `bar,"substantially asdescribed.

.4. In a jack, a frame, a lifting bar, and

a plurality of spaced anti-friction rollers arranged in a pocket in saidframe for maintaining the bar out of direct sliding engagement with theframe, saidk rollers being mountedin removable open bearings formed in amember positioned in said pocket, said rollers being held insaidbearings by said lifting-bar, substantially as described.r- Y

5. lIn a'jaclna'frame, a lifting bar, and a plurality of* spacedanti-friction rollers'arff ranged in a pocket in said frame for main-vvtaining the'bar out of direct sliding engagement with the frame, saidrollers being mountedin -open bearings formed in :a -U- shaped memberremovably seated in said pocket, substantially yas described.

6; In ,a jacln'a frame, a lifting ban slideffectiveintermediatethejfra-me :andthe lifting bar for maintaining the bar outof direct tiall-y as described.- l VIn 'testimony whereof Ihave hereuntoset 1 my handf WILLiA-M o-jvvooniNGsQg l k6o able in said frame, andananti-friction roller;

